Was looking for a version of Otamatone which will not play sound through the speaker when headphone is plugged in, which is the Techno version - perfect for playing in a quiet neighborhood at midnight. Easy to learn hard to master.
It came with 3x AA batteries, a 3.5mm cable for connecting to a phone, manuals in Japanese, English, and German, and a Otamatone Techno strap.
3 holes at the back of the Otamatone Techno, one for connecting to a phone, one for headphones, one for DC 5V power which you can use instead of the 3x AA batteries. The screw for the battery compartment was designed to be unscrewed/tightened using any thin coin, which was very thoughtful. There is a foam block inside the mouth of the Otamatone so be sure to remove that before complaining about it being too quiet.